Systems and methods for image acquisition

Abstract

The present disclosure relates to a method and system for reducing radiation dose in image acquisition. The method may include obtaining first image data of a subject related to a first scan of the subject. The first scan may be of a first type of scan. The method may include reconstructing a first image of the subject based on the first image data and generating a dose plan of a second scan based on the first image. The second scan may be of a second type of scan. The method may also include obtaining second image data of the subject related to the second scan of the subject. The second scan may be performed according to the dose plan.

We claim: 
     
       1. A method implemented on a computing device including a processor and a storage media, the method comprising:
 obtaining first image data of a subject related to a first scan of the subject, the first scan being of a first type of scan, the first scan having a first scan duration; 
 reconstructing a first image of the subject based on the first image data; 
 generating a dose plan of a second scan based on the first image, the second scan being of a second type of scan; 
 obtaining second image data of the subject related to the second scan of the subject, the second scan being performed according to the dose plan; 
 obtaining third image data of the subject related to a third scan of the subject, the third scan being of the first type of scan and having a second scan duration, and the second scan duration being longer than the first scan duration; 
 reconstructing a third image based on the third image data; and 
 generating a fourth image based on the third image and the second image data. 
 
     
     
       2. The method of  claim 1 , wherein the first type of scan is at least one of a positron emission tomography scan, a single photon emission computed tomography scan, or a magnetic resonance scan. 
     
     
       3. The method of  claim 1 , wherein the second type of scan is a computed tomography scan. 
     
     
       4. The method of  claim 1 , wherein the determining the dose plan of the second scan based on the first image comprises:
 determining at least one lesion in the first image; 
 determining at least one region of interest (ROI) in the first image based on the at least one lesion, the at least one ROI enclosing the at least one lesion; and 
 determining the dose plan of the second scan based on the at least one ROI, the dose plan including a first dose corresponding to the ROI and a second does corresponding to a region outside the ROI, and the first dose being higher than the second dose. 
 
     
     
       5. The method of  claim 4 , wherein the determining the at least one ROI in the first image based on the at least one lesion comprises:
 determining at least one candidate ROI in the first image based on the at least one lesion, the at least one candidate ROI enclosing the at least one lesion; 
 determining a coordinate range of the at least one candidate ROI along an axial direction; and 
 determining the at least one ROI in the first image based on the coordinate range of the at least one candidate ROI along the axial direction. 
 
     
     
       6. The method of  claim 1 , the generating a fourth image based on the third image and the second image data further comprising:
 reconstructing a second image of the subject based on the second image data; and 
 generating the fourth image by correcting the third image based on the second image. 
 
     
     
       7. The method of  claim 6 , wherein the correcting the third image based on the second image comprises:
 performing an attenuation correction on the third image based on the second image. 
 
     
     
       8. The method of  claim 1 , the generating a fourth image based on the third image and the second image data further comprising:
 reconstructing a second image of the subject based on the second image data; 
 correcting the third image based on the second image; and 
 generating the fourth image based on the corrected third image and the second image by fusing the corrected third image and the second image. 
 
     
     
       9. A system, comprising:
 at least one storage device storing a set of instructions; and 
 at least one processor in communication with the at least one storage device, wherein when executing the set of instructions, the at least one processor is configured to cause the system to:
 obtain first image data of a subject related to a first scan of the subject, the first scan being of a first type of scan, the first scan having a first scan duration; 
 reconstruct a first image of the subject based on the first image data; 
 generate a dose plan of a second scan based on the first image, the second scan being of a second type of scan; 
 obtain second image data of the subject related to the second scan of the subject, the second scan being performed according to the dose plan; 
 obtain third image data of the subject related to a third scan of the subject, the third scan being of the first type of scan and having a second scan duration, and the second scan duration being longer than the first scan duration; 
 reconstruct a third image based on the third image data; and 
 generate a fourth image based on the third image and the second image data. 
 
 
     
     
       10. The system of  claim 9 , wherein the first type of scan is at least one of a positron emission tomography scan, a single photon emission computed tomography scan, or a magnetic resonance scan. 
     
     
       11. The system of  claim 9 , wherein the second type of scan is a computed tomography scan. 
     
     
       12. The system of  claim 9 , wherein to determine the dose plan of the second scan based on the first image, the at least one processor is configured to cause the system to:
 determine at least one lesion in the first image; 
 determine at least one region of interest (ROI) in the first image based on the at least one lesion, the at least one ROI enclosing the at least one lesion; and 
 determine the dose plan of the second scan based on the at least one ROI, the dose plan including a first dose corresponding to the ROI and a second does corresponding to a region outside the ROI, and the first dose being higher than the second dose. 
 
     
     
       13. The system of  claim 12 , wherein to determine the at least one ROI in the first image based on the at least one lesion, the at least one processor is configured to cause the system to:
 determine at least one candidate ROI in the first image based on the at least one lesion, the at least one candidate ROI enclosing the at least one lesion; 
 determine a coordinate range of the at least one candidate ROI along an axial direction; and 
 determine the at least one ROI in the first image based on the coordinate range of the at least one candidate ROI along the axial direction. 
 
     
     
       14. The system of  claim 9 , wherein to generate a fourth image based on the third image and the second image data, the at least one processor is further configured to cause the system to:
 reconstruct a second image of the subject based on the second image data; and 
 generate the fourth image by correcting the third image based on the second image. 
 
     
     
       15. The system of  claim 14 , wherein to correct the third image based on the second image, the at least one processor is configured to cause the system to:
 perform an attenuation correction on the third image based on the second image. 
 
     
     
       16. The system of  claim 9 , wherein to generate a fourth image based on the third image and the second image data, the at least one processor is further configured to cause the system to:
 reconstruct a second image of the subject based on the second image data; 
 correct the third image based on the second image; and 
 generate the fourth image based on the corrected third image and the second image by fusing the corrected third image and the second image. 
 
     
     
       17. A non-transitory computer readable medium comprising executable instructions that, when executed by at least one processor, cause the at least one processor to effectuate a method, the method comprising:
 obtaining first image data of a subject related to a first scan of the subject, the first scan being of a first type of scan, the first scan having a first scan duration; 
 reconstructing a first image of the subject based on the first image data; 
 generating a dose plan of a second scan based on the first image, the second scan being of a second type of scan; 
 obtaining second image data of the subject related to the second scan of the subject, the second scan being performed according to the dose plan; 
 obtaining third image data of the subject related to a third scan of the subject, the third scan being of the first type of scan and having a second scan duration, and the second scan duration being longer than the first scan duration; 
 reconstructing a third image based on the third image data; and 
 generating a fourth image based on the third image and the second image data. 
 
     
     
       18. The non-transitory computer readable medium of  claim 17 , wherein the determining the dose plan of the second scan based on the first image comprises:
 determining at least one lesion in the first image; 
 determining at least one region of interest (ROI) in the first image based on the at least one lesion, the at least one ROI enclosing the at least one lesion; and 
 determining the dose plan of the second scan based on the at least one ROI, the dose plan including a first dose corresponding to the ROI and a second does corresponding to a region outside the ROI, and the first dose being higher than the second dose. 
 
     
     
       19. The non-transitory computer readable medium of  claim 18 , wherein the determining the at least one ROI in the first image based on the at least one lesion comprises:
 determining at least one candidate ROI in the first image based on the at least one lesion, the at least one candidate ROI enclosing the at least one lesion; 
 determining a coordinate range of the at least one candidate ROI along an axial direction; and 
 determining the at least one ROI in the first image based on the coordinate range of the at least one candidate ROI along the axial direction. 
 
     
     
       20. The non-transitory computer readable medium of  claim 17 , the generating a fourth image based on the third image and the second image data further comprising:
 reconstructing a second image of the subject based on the second image data; and 
 generating the fourth image by correcting the third image based on the second image.